<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="/doLogin" method="post">
   用户名: <input name="username" type="text"><br/>
   密码: <input name="password" type="password"> <br/>
    <input type="hidden" name="url" th:value="${url}">
    <input type="submit" value="登录">
</form>
</body>
</html>